export function getDiffArray(aLength: number, bLength: number, str: string): string[] {
  const a = Array.from({ length: aLength }, (_, i) => i + 1);
  const b = Array.from({ length: bLength }, (_, i) => i + 1);

  const diffArray: string[] = [];

  for (let i = 0; i < a.length; i++) {
    if (!b.includes(a[i])) {
      diffArray.push(`${str}${a[i]}`);
    }
  }

  return diffArray;
}
